What’s the most optimal DMax Articuno counters?

I have all the GMax and DMax counters powered up to lv40 and maxed the moves. I am confident to take it down but in case I need to carry somebody without good counters, it would be good to know the optimal combination of the three counters I should put in my team and others. Thanks

Update: thanks for all your responses. a few days in, I have been able to beat the boss every time and the best was that I duoed it with level 40 counters or lower, Blastoise, Lapras, and Tontricity.